Help! in asterisk

Good day Sir…

I am new to asterisk someone told me to use it for my project. I am trying to create an application which calls will be received through P.C. like applications used by Call Center Companies and i am using PHP as my programming language. The problem is i don’t know where to start and how to use asterisk to pass the land line calls to P.Cs

Can someone help me to figure this out.

Thanks a lot.